Peel 5 or 6 red potatoes. Slice potatoes into chips about 1/4 inch thick and place in a bowl.
Use a cast iron frying pan (large) and add 1 TBSP of lard or Crisco in the pan. You can dice a medium onion if you desire. Turn heat on medium and melt the lard or shortening. Add the sliced potatoes and sprinkle 1 level tsp. of salt (and 1/2 tsp. pepper if you like pepper) over the potatoes and add the diced onion. Place a lid on top of the frying pan. Fry for about 5 minutes, then use a spatula to turn all of the potatoes on the other side and brown that side about another 5 minutes. If it gets dry add more lard/shortening. Turn potatoes again with the spatula. Continue frying and turning them for about 20 minutes total until well browned. Test with a fork for doneness.